Is this U-notch sight (.325x.156) designed to fit Government 1911A1 pistols (70 series) in .45 ACP? I have a replica (Tisas "service" model), with the GI front & rear sights that I want to upgrade.

Hello Sir, No Fusions Rear U notch style sights are only for the .495 Novak style dovetail they will not work in the .330 Mil spec dovetail.

U-Notch Sight Selector

Fusion 1911 U-Notch Sight Selector for Precision Aiming

Introducing the Fusion “U” Notch Sight Selector, meticulously crafted for your 1911. Available in a diverse range of configurations including Black Serrated Target, 1 Dot, and 2 Dot Tritium, this sight is designed to elevate your shooting precision and rapid sight picture acquisition.

Distinguished Features:

Versatile Configurations: Choose between Black Serrated Target, 1 Dot, and 2 Dot Tritium to suit your sighting preferences.
Optimal Sizing: Tailored to fit Standard .495” X 65-degree dovetail bases and available in heights of .325 for 5 and 6-inch 1911s or .375 for Commander and compact models.
Varied Notch Width: Choose between .125”, .140", or .156" notches for a sight picture that complements your shooting style.
Harmonious Pairing: Pairs seamlessly with the XS front sight, with three notch widths for optimized dot framing.
Rugged Construction: Manufactured from solid steel bar-stock, with CNC precision machining and a robust Black Oxide finish.
Professional-Grade: Fusion’s commitment to professional-grade quality is manifest in every detail of this sight.
Effortless Precision: The U-notch designs, available in .125" that slightly intersects the dot, .140" that encases the dot impeccably, and .156" providing a bit of spatial grace, afford you diverse targeting options. Optimize your sight picture for fast, reliable targeting in dynamic shooting environments, whether it’s IDPA, action shooting, or everyday carry.

Compatible Models:

Fusion Freedom Series Pistols
Colt Combat Commander
Colt Defender
Colt Competition Series
Colt Gold Cup Series
Colt Delta Elite Series
Colt Combat Elite Series
Colt Combat Unit Series
Colt Wiley Clapp LW Commander
Nighthawk Custom Models
Springfield 1911 Ronin Series
Springfield 1911 Garrison Series
Springfield 1911 Operator Series
Springfield 1911 Emissary Series
Springfield 1911 Vickers Tactical Series
Springfield 1911 TRP Series
Smith & Wesson SW1911 Series
Dan & Wesson 1911's
Remington 1911's
Kimber 1911's
RIA Rock Series 1911's
RIA TAC Series Pistols
RIA PRO Series Pistols
Compatible with any 1911 pistol and clones featuring standard dovetail/Novak compatible cuts (.495"x65°)

Made in the USA:

Fusion’s U-Notch Sight is not only made with utmost precision but also embodies local craftsmanship, being entirely made in the USA.

Package Includes:

Rear Sight
Hex Wrench
Retaining Screw

Installation Tips:

Tailored Fit: Always opt for a sight designed specifically for your pistol's model to guarantee a flawless fit.
Precision Fitting: Sight dovetails might have slight variations; arm yourself with an appropriate file to attain the perfect friction fit.
Expert Assistance: If installation appears daunting or you're not equipped with the right tools, don't hesitate to seek guidance from an experienced gunsmith.

Upgrade Your Sight Picture with Fusion

Elevate your aiming precision and rapid target acquisition with one of the finest combat fixed sights available on the market. Fusion brings you professional-grade quality, ensuring that every shot counts, from the range to real-world applications.

Ensure the ultimate performance of your 1911 with the Fusion U-Notch Sight Selector, your ally for impeccable shooting and reliability.